Campbell Scientific CS110 Overview - Manual (Page 5)

The reciprocating motion of the CS110 electric-
fi eld meter is limited to approximately 5 Hz,
which is adequate for lightning hazard warn-
ing, where 1 minute averaged data is often
used. For applications desiring >5 Hz, the
CS110 reciprocating electric-fi eld meter can be
confi gured as a slow antenna (MacGorman and
Rust). The shutter would typically be left open
indefi nitely in slow antenna mode and a resistor
electronically switched into the charge amplifi er
providing a 66 ms decay time constant. In the
slow antenna mode, the CS110 is a fi eld change
meter with the charge amplifi er having a high-
pass fi lter frequency response with the lower
cutoff frequency defi ned as f3dB = (2
πR·C) -1 =
2.4 Hz. In slow antenna mode the charge ampli-
fi er output can be sampled by the datalogger as
fast as every 20 ms (50 Hz), using 250 µs inte-
gration durations for the analog integrator.
The CR1000 datalogger embedded within each
CS110 can be used to extend the capability of
the CS110. The CR1000 provides measurement
and control functions, data processing and stor-
age, a user interface language (CRBasic
TM ), and
fl exible communications options. LoggerNet TM
datalogger support software (purchased sepa-
rately) provides versatile networking and data
collection capabilities.
Stator
Shutter
Figure 5. CS110 Polished 316-L Stainless Steel Electrodes
Figure 6. CS110 Average Current Consumption versus Measurement Interval
A
verrage Current (mjA) @ 12 V
Measurement Interval (Seconds)
Tefl on
insulator
Sense electrode
5